Results 61 to 70 of about 15,552 (245)
Atmospheric sulfur is recycled to the crystalline continental crust during supercontinent formation
Nature Communications, 2018 The long-term evolution of the sulfur budget in the lithosphere is poorly constrained. Here, using mass independent isotope fractionation as an indelible tracer, the authors track the pathway of sulfur from the Earth’s surface to punctuated episodes of ...
Crystal LaFlamme +3 more
doaj +1 more source
Frontiers in Microbiology, 2018 The sulfur isotope record provides key insight into the history of Earth's redox conditions. A detailed understanding of the metabolisms driving this cycle, and specifically microbial sulfate reduction (MSR), is crucial for accurate paleoenvironmental ...
Emma Bertran +8 more
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Multiple Sulfur Isotope Records of the 3.22 Ga Moodies Group, Barberton Greenstone Belt
Geosciences, 2020 The Moodies Group, the uppermost unit in the Barberton Greenstone Belt (BGB) in South Africa, is a ~3.7-km-thick coarse clastic succession accumulated on terrestrial-to-shallow marine settings at around 3.22 Ga.
Masafumi Saitoh +6 more
doaj +1 more source
Integrated Environmental Assessment and Management, EarlyView., 2023 Abstract In the Lake Koocanusa‐Kootenai River system (Montana, USA and British Columbia, Canada), selenium (Se) contamination has become an international concern and is suspected to contribute to the observed burbot (Lota lota) population collapse. Due to our limited ability to sample burbot in Lake Koocanusa for monitoring studies, we used a reference
Stephanie D. Graves +6 more
wiley +1 more source
Acetylene Semi‐Hydrogenation by Photocatalysis
Angewandte Chemie International Edition, EarlyView.Photocatalytic acetylene semi‐hydrogenation is an emerging light‐driven route to polymer‐grade ethylene, offering a mild alternative to energy‐intensive thermocatalysis. By replacing H2 co‐feed with water or other proton sources, these systems can achieve high selectivity under ambient conditions.
Anna Fortunato +6 more
wiley +1 more source
Applied Water ScienceThis study focused on the chemistry and isotopes of sulfur in lakes. The bottom sediments and water columns of lakes were found to contain reduced forms of sulfur, including hydrogen sulfide ions, elemental sulfur, and thiosulfate ions, along with ...
S. V. Borzenko, I. A. Fedorov
doaj +1 more source
Off limits: sulfate below the sulfate-methane transition
Frontiers in Earth Science, 2016 One of the most intriguing recent discoveries in biogeochemistry is the ubiquity of cryptic sulfur cycling. From subglacial lakes to marine oxygen minimum zones, and in marine sediments, cryptic sulfur cycling – the simultaneous sulfate consumption and ...
Benjamin Brunner +4 more
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Uncaging Iridium(III) Complexes for Combined Photodynamic and Photoactivated Chemotherapy
Angewandte Chemie International Edition, EarlyView.Light‐activatable iridium(III) anticancer prodrugs demonstrate how chalcogen coordination controls photoinduced therapeutic activity. Upon visible‐light irradiation, sulfur‐ and selenium‐based caging ligands undergo distinct oxygen‐dependent photoreactions that trigger ligand release and singlet oxygen generation, enabling combined photoactivated ...
Victoria V. L. Müller +5 more
wiley +1 more source
Sulfur Isotope of Epilithic Mosses to Trace Variation of Atmospheric Sulfur Sources
Journal of Isotopes, 2016 全文: PDF (5099 KB) HTML (1 KB) 输出: BibTeX | EndNote (RIS) 摘要 为探讨石生苔藓硫同位素组成特征对区域性大气硫源的指示作用，连续两年采集鄱阳湖生态经济区内的石生苔藓样品，测定δ34S值；并结合已有的雨水、煤的硫同位素值等相关研究数据进行对比分析。样品δ34S值均偏正，平均为+4.9‰，取值范围为+1.9‰~+9.6‰；石生苔藓δ34S值与空气中SO2浓度呈负相关关系；南昌 ...
HU Fei-fei1,2;PAN Jia-yong1,3;ZHANG Liang1,2;XIE Shu-rong3;CHEN Yi-ping3;XIA Fei1,3
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Biofuels, Bioproducts and Biorefining, EarlyView.Abstract Improving fertilizer use efficiency is essential for reducing environmental pollution, sustaining agricultural production, and maximizing the economic profitability of crop production systems. This study tested the hypothesis that the formulation strategy of biochar‐based fertilizers, rather than nutrient addition alone, is associated with ...
Md. Al‐Amin +7 more
wiley +1 more source